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Apparently the bluefin-21 is getting good images down there with that side scan sonar giving 3-d images of the ocean floor. but of course everyone is just hoping it will find some sign of flight 370. we'll tell you bill, we're talking to people involved in the search and off the record there expressing a lot of confidence they are in the right place. let's remember this is only trip five. there is a long way to go, bill. >> what about the oil sample, the slick discovered over the weekend, tested and turned out not to be a match. did that deflate hopes? >> well, not really. i think a lot of peo...

Traffic control recording from the night the plane went missing. also this morning we learned an oil sample from the indian ocean is not from an aircraft engine or hydraulic fluid. that means that rules that out as a clue. early tests did rule out that possibility. as i said, with no debris found yet or electronic pulses detected, in a week the data from the bluefin-21 becomes more critical. the unmanned vehicle finally completing its first full mission today, and with authorities cautioning there is still a long way to go, australia's top air accident investigator says the cost of a prolonged...

Meters. there was concern that that was too deep for the bluefin. but the engineers say it can operate at that depth with no problem. >> also being analyzed, an oil sample spotted on the ocean surface in the search zone. officials hope to learn if it is in fact aviation fluid or if it is something else. cnn's michael holmes joins us from perth on the latest from the operation. michael it seems that the bluefin was able to map the area, but so far nothing reported. how long is the effort supposed to take? >> reporter: yeah, third time is the charm, john, from the bluefin-21, as you said, the fi...

Children not to get off the boat? and of course, this is referring to this p.a. announcement that eyewitnesses have told media they heard that they were told not to move, that it was dangerous for them to move, and so they had to stay put. and that eyewitness, a student who got out alive, said the reason he got out alive is because he disobeyed that order. >> one of the key questions we're going to ask experts coming up. why were they told not to move? how is it that the captain managed to survive with only one lifeboat deployed? paula hancocks from south korea, thank you so much for being wit...

Square kilometers and the data from the latest mission is being analyzed. the oil sample collected by ocean shield has arrived in perth and is being analyzed, as well. we will bring you the results as soon as they become available. back now with my panel of experts to answer your questions. jeff wise, we have a question from susan. it says why not take one search plane and research the flight path. maybe they would spot path. you know you retrace your own steps when you lose something, just a thought. is that a common seance approach. would that be helpful to do that with the data we have? >> ...